Problem with drawpolygon in GUI

Question

Christoffer Johansson Westheim 2022-8-18

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https://ww2.mathworks.cn/matlabcentral/answers/1781320-problem-with-drawpolygon-in-gui

回答： Githin George 2023-10-5

Hi,

I have a GUI with two axes in it where I use drawpolygon to generate a roi in one of the axes. This has worked fine in Matlab 2020a, but after upgrading to Matlab 2022a I can draw the polygon, but I can no longer modify it. I have noticed that the surf that the polygon is drawn on top of changes "resolution" - bocomes less smooth - when I start drawing and think the problem is associated with the h.draw function.

I have tried the drawpolygon in a regular figure and there is works as expected so it seems associated with the axes in the GUI.

Anyone knows how to work around?

Regards,

Christoffer

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Answer 1

Githin George 2023-10-5

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Hello Christoffer,

In order to modify the ROI polygon once you create it using “drawpolygon” function in MATLAB R2022a, you can try changing the ‘Layer’ property to ‘front’ as a workaround for the issue.

roi = drawpolygon(handles.axes,'Layer','front');